MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Formbook


Vendor detections: 11


Intelligence 11 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05
SHA3-384 hash: ae42a1a9886b6e926554d5eaa3d4fe06a18ec8619dc7d783dfad31563fc15c3fef6522fb27d669fff244d6f7f9670efd
SHA1 hash: 6359cfa49eeb142f10a1ba9812c115fd63c945dc
MD5 hash: 16c377d7e3761bc37d6a134080461af8
humanhash: river-fifteen-tennis-ack
File name:70.doc
Download: download sample
Signature Formbook
Create hunting rule
File size:23'835 bytes
First seen:2022-08-01 13:14:56 UTC
Last seen:Never
File type:Word file doc
MIME type:application/octet-stream
ssdeep 384:+vVG78AB4GodLBx2N8LF9LBCtpJT04Po+XhuqaMJYzObnxcFoKz:+9IPB4nx2qFpBCvJY0hpaMC6LGFnz
TLSH T137B2897EB68B8E4CEA07D755040ABFB6166DF81D62C444C1BBBCE7307E1C94A8B12538
Reporter JAMESWT_WT
Tags:doc FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
247
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
SPAM.zip
Verdict:
Malicious activity
Analysis date:
2022-08-01 13:04:45 UTC
Tags:
trojan opendir exploit CVE-2017-11882 loader encrypted formbook stealer
Link:
https://app.any.run/tasks/622fdd69-41d0-4dc3-abaa-ed6336c58542

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/msword
Has a screenshot:
False
Contains macros:
False
Detection(s):
SecuriteInfo.com.Spam-473.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.27333.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-1.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.26244.RtfHeur.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.EvilRTF.CVE-2017-0199-Obfus.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05/results/dashboard
Verdict:
No Threat
Threat level:
  10/10
Confidence:
100%
Tags:
javascript
Link:
https://www.filescan.io/uploads/62e7d1e1bcf76fcb6cd849c2/reports/96f60eaa-4066-4e01-88d1-84c1157bf6a5/overview
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1044316
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Initial sample is an obfuscated RTF file
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office equation editor drops PE file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 676805 Sample: 70.doc Startdate: 01/08/2022 Architecture: WINDOWS Score: 100 48 Initial sample is an obfuscated RTF file 2->48 50 Malicious sample detected (through community Yara rule) 2->50 52 Antivirus detection for URL or domain 2->52 54 16 other signatures 2->54 9 EQNEDT32.EXE 12 2->9         started        14 WINWORD.EXE 291 21 2->14         started        16 explorer.exe 15 2->16         started        process3 dnsIp4 46 104.168.32.38, 49171, 80 AS-COLOCROSSINGUS United States 9->46 38 C:\Users\user\AppData\Local\...\vbc[1].exe, PE32 9->38 dropped 40 C:\Users\Public\vbc.exe, PE32 9->40 dropped 72 Office equation editor establishes network connection 9->72 74 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 9->74 18 vbc.exe 1 8 9->18         started        42 C:\Users\user\Desktop\~$70.doc, data 14->42 dropped 44 ~WRF{23BD856D-D650...7-8900F1DB20B6}.tmp, Composite 14->44 dropped file5 signatures6 process7 file8 34 C:\Users\user\AppData\...\qEggUVSmROjcLY.exe, PE32 18->34 dropped 36 C:\Users\user\AppData\Local\...\tmpD512.tmp, XML 18->36 dropped 56 Multi AV Scanner detection for dropped file 18->56 58 Machine Learning detection for dropped file 18->58 60 Uses schtasks.exe or at.exe to add and modify task schedules 18->60 62 2 other signatures 18->62 22 vbc.exe 18->22         started        25 powershell.exe 6 18->25         started        27 schtasks.exe 18->27         started        signatures9 process10 signatures11 64 Modifies the context of a thread in another process (thread injection) 22->64 66 Maps a DLL or memory area into another process 22->66 68 Sample uses process hollowing technique 22->68 70 Queues an APC in another process (thread injection) 22->70 29 explorer.exe 22->29 injected process12 process13 31 raserver.exe 29->31         started        signatures14 76 Modifies the context of a thread in another process (thread injection) 31->76 78 Maps a DLL or memory area into another process 31->78
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05/
Threat name:
Document-RTF.Exploit.Minerva
Create hunting rule
Status:
Malicious
First seen:
2022-08-01 13:15:08 UTC
File Type:
Document
Extracted files:
5
AV detection:
13 of 26 (50.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=57fanwq32kkb2h2cdd4c2qeidncnq7wpnugqhevgwiktbcexfmcq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
n/a
Link:
https://tria.ge/reports/220801-r5ab7sagdk/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Checks computer location settings
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/efca06da1bd2/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.05
Link:
https://yomi.yoroi.company/submissions/efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:SUSP_RTF_Header_Anomaly_RID2F7F
Create hunting rule
Author:Florian Roth
Description:Detects malformed RTF header often used to trick mechanisms that check for a full RTF header
Reference:https://twitter.com/ItsReallyNick/status/975705759618158593

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

Formbook

Word file doc efca06da1bd2941d1f4218f82d40881b44d87ecf6d0d0392a6b2153088972b05

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2263545/
  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/2263604/

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